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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d75324294c60167ac5d9ac96d6d18b21d2f3fa56b62a4f93b5f523ee16acd42' 
  AND token = '13Nqk7cNf8e4thfCrARbiRK/aZM+11Whr+h2Tfj1RTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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