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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ad4b6e9496d0aa5719c50a5adf2c3f9bfd5d2278ed3373f40d1d396c3ba9772' 
  AND token = 'TLWGkRB22wTje/1aKW/G5QEtm5jTUSw9xY+Gt+fNr4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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