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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06e74892973e41c23c57a08d14320bb3a52ce6589716d078b7eda59c655ac97f' 
  AND token = 'yp8Po1Udko4WTBCeokuZjG7XYC9CBm4uBh5esuw7agw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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