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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0036663c5357ef032b0eb7b57e69cca161750b042f8c0b63c6c5f9b791398c5' 
  AND token = 'jthzb5ymP2lWlSdb8BKRUZ4dQwSCZlvlwEcLqMOKAYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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