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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb886a79e26cc1aed18206980f93d2e64fec4486b9b0a2db9e7223bcc6a0b63a' 
  AND token = 'hlfYKTxZRgZq4sYNr0JyN8EfcrkuIOLKxFG8/9WYmFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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