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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6f9cf13008e2f2486b9d7730dabd67efc13c7c3eb3bd7aeebe17d5b824d330' 
  AND token = '4Crp8gDRTEzqDedDqOlTDD28NoVKlG5iGLBNxdEVP08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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