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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e160ddbf320fc7474d403b906e36b05b85e8723fc5f7fb60b5a398fee00cbc2' 
  AND token = 'l7BmurAlC97t8ErsfCuNxfZdliNrsvxnm/E9xQIZYVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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