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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f03538629104c757054853b885c4e6dffd93672ca549f3f82bd7dfad90af77a2' 
  AND token = '07J8CNHYRebemowA1tjfCddkVgFRuy7TAWUaRjikqKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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