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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71d921fad7b26cba2095d218cf352746e2aa9adbf148b0d58b9fbfd0f93e3da' 
  AND token = 'VWwn0EqIjItgHEYG1MeX8tFlqHL+brfsGGautpfP87Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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