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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78e70ceb098b143ffe340c3a7325aeb72acbb226b7eee45c8cfba228cbb0c81' 
  AND token = 'pz93SxjBbv/D4B9W77XShX3bwgGlnIuhKWUeFK4Er+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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