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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b6d4c59b93d05c1d39bdbc231b99570b6c965e62e1ec6e0cc11fc8364a512a' 
  AND token = 'a7mxwshSdk7zwnZhEKTOME5rGGOhx9Mm3T+07bm5dHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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