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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a2ab226241ee387b8d717a09d2cde0f0c30ef0301a9dbf9037b7058e028556' 
  AND token = '1femlIIkQlfKlTvXd5exTnwuISDHpHjDPgXSKMqYE0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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