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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215dd59dcec8bd036c054aa8b34ec5e5f85d6cbf3d30d19e12df69f8f899c903' 
  AND token = 'Z8NqhwWbRASBwu5sy8Red1GjdXvw1tfBkbE/xOscB0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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