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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0643d1b766ca44997f756ec1864d38e70d66e804facf3b062cd3587b3e634a' 
  AND token = 'OE0yIxFMQW+oVWnsEe7wHfz5Sb2DAsqaXAWqzeErHp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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