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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960f7813de34fbecdd90c8131cae1f0c1f0d57cc40a680d35fb60d1714da2881' 
  AND token = '3pC+J0hSn1zut9jzB7hAt+YUFnRYDG1+FRAsvkJYVrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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