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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8b51235233ceeff116edad15d644d20e410c6456162050660ef5c572d3cb65' 
  AND token = 'XRbf4dZD20WjrpMdq0nFUZTnjD6s3kSn4c43PL8ZjNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}