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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f7355c647c7dc69e5a0cdb236e864ff3253a37ca4176b85adfd4e31fe602d3' 
  AND token = 'Q3KYtd0VUcJzycXDgvHt4xOADlB/nAT+zhQAiIcF4EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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