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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd590cf461fa2ee4c1addd704efefdc6faaf7799933b6b6a738cd673c19d7f0a9' 
  AND token = '7Mc5ugAZNPuhp28v9k04eV8VQXiICdQiWkxUJVGNdsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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