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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080a1569d8dabe865243b8a7fae4c82a1b9c57fa52e8a7fbedeffad09f32bb9e' 
  AND token = 'unFjhwcwyw2waCtCzKuJG/kQZITHiVxtQY0VR7cbCYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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