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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8667fff9df207ee00733d335c3f138d966cbb3bfc6d39265eb2d3912f0eebb8' 
  AND token = '8QcNSmBUm6Sdwt8+jxC0JZgqyhu2NHYUJTuXyPSfh9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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