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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c23a9a1c85e3331062f899087e45a8a9fd4845a7513f9f99613ef01f72ba70' 
  AND token = 'O9ZsxAAvApRbp6Zutwvw3CFOJL1FOI73/DG19vtVefc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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