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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3570cb6425719402f80ad263b1e9d77a1d8822b2cf7687d8eeae2e2f7a5842' 
  AND token = 'Hj0z89SEfB6cBp6JeNojIZeBW5y5SXiVR2Seu7fK4RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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