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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28875fd86d03e409dc24792ab00d88e37bbb6f90d80e4d583efff001905057e1' 
  AND token = 'wLiga7XjvXCEzAobf7Z7PeWv2ToIeYKhTM4bw0sHzfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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