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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6405f5c8b212cd4722ebae69ba0776807be76015f6419b8b90263abc7da6d611' 
  AND token = 'E8+Bnya74jei8g8w+7wL0U3aeVRFv8Wa3XZKhs9rs2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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