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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd733c5e83e3a0b9e22bcab5c369c5d115b5350b79b4001aa5fc5b92196e652' 
  AND token = 'BxWiS75Ce2Q7Nm4RBQ7mU84v1PXPTV6Eq29vAZsv39c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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