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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a38fdee4f187ec1f6579072fb72cb259ef49ceb5eb2d4a01653ff770f42d02aa' 
  AND token = 'Wf5ZE7WTp7rQJfAGLQBxpjYp65j80tMmmO0BNwTMots=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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