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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a4b3db335ef11f72589826f168a4a73325187ab230bf5460f499ed4938d22f' 
  AND token = 'ICnLOZtTDwOI3FSg/lUM+/ilFbEABx9Ug3ln9PyZRaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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