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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52a7547350db149453247959ce836d0fdf1083fa592375f875d62ba6b60ff088' 
  AND token = 'P+f4RqUJRGT6Pyxjbp8uc9yTCRnEPxwDqrSR0BDqdss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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