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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1360f4f5c1d59fdf985520c1ff42cef2ba817d9d2ce63a5e825baaa31e6ccaf5' 
  AND token = 'wPQbgrd4qmm6OCAGYHgxl9/FSFU0qoRYFzk2LLf97qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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