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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed234696b8e0207aaee82357df43144e5273d6b915573be617302de3fac37075' 
  AND token = 'MRYRbYG7QpLY/H4jPoeu9MlTvSFLSUM7UcYvsZ0U8Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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