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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cd4e8e9bc6e7d4b5b88d68c7ac6fd0138eea2bddeea6e4981591c176549746' 
  AND token = 'alCr0Gw54sjesnoC0lmS8+P0tu61DBwutPN9VHkfoqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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