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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57392b4d1d40ebe3c8f31745269f0a4d5086bbf62420fcf56f1c360f77ee9784' 
  AND token = 'qU8G289f0PyyW8SjmvqsI+OU6x0zg94O1ddmns7fx04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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