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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d6f07b015f6d07401d3ed40f40021e40561ed4fb1c8ec551e49411b23e7ca3' 
  AND token = '6dL89YdUJ4XOr6XZ4M3Yl2KLVpTI5aEDrsBJBdn9q1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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