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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87ae89e5a656b39d93837c7b68dbfd2c4667ec95cab5110aca2aac9f6f9516f9' 
  AND token = 'bh/5bFwit5EdOmF4ulqfp0I+ehyCoWIsArhY+u4eezU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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