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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ebb109d7b0685b9de601abe34de579747b2959cd8cbfdcb0e62cde313a7d81e' 
  AND token = 'ka8lUJ0xSRG8wQB0BuQsQ2iyJsOScnNLmEOk6d91OYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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