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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929f2af02d167b2e87f391992e2a805c326d2d77f4ddbf45d57aa36e8e6a595a' 
  AND token = 'e9yQLojOLG3xnwTzrWc+bHj+JlHS71RaIK3R0wGFkhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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