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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362785df95d17b54f89e1a09e48865d68040b652da0bf9cd103611bec5f55f5c' 
  AND token = 'j4Hmo/fIySLMwTqESHW3XcH4JEFuzVhcyhqjsrv3V2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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