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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88c3cce46b075d510473f0412a21ac242c57c88b303d95340baa2453e28c1f8' 
  AND token = 'ZTAZFh6aLtu2c/Q7asMuAmqVgxSUfKbsFbhHkQ/nE8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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