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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd361e3887956c48f5e810e3e7d53dddb57390988b395cd1bb16133f168fc2ef' 
  AND token = 'FItmhBcw70MPNC7etU0kBmK/dPW4l0GsAHmeuNKNATo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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