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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acde4d151fb5d3e3a0d240443763f553c958357741a8f8e0aac4aa91533dc1c5' 
  AND token = '+9l8vV7KjNkpGQ/KgV4A7Xnq+XIGtEp/Da0BLevzR3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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