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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95ecfbe0658141b4c342267075f3c46a31cae68b9e28d9753ac0855dfc3e8a4' 
  AND token = 'C4j/7lDCMxxCj26dAVYR7KKlQ2rk+dad/ORVZDclaLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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