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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1aaef9ece430b4c48f151dde24d7dba021d1c91c71ff2d95730faa5ca354eb' 
  AND token = 'ra0P5//MEIjZqe+ZURKGSSb0Wx9xW4mK8fGVkx2sDtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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