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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8f30a8890cd8dfa4659a2c76f3c48a6fef0d5f76526f0b8efe55f3a9317403' 
  AND token = 'uqfGxkEjf/U7rpLQ7no2aso7ab3liPywzpsxTX6/dRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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