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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b22249bed4cca74d55321b9afb5fedfafc12257ae74c0e52de940d38479f6b' 
  AND token = 'qPcv9EnyJxDEWGOaSzQvxbGg6HlPO8eubX98nxtMMws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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