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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9dcf7f309ede74512edec18cf6b98f7c1dce4f8d9218b5ac2bd8930c0a52753' 
  AND token = 'IrplIEhgkiF3xM9bEx9T2Fx3zvQS3/EBa5sPK0uLvrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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