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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3526a8cb9d69c4ad2d2e0cd0a37d5664151f1e4c0611fa4100ff5226307413' 
  AND token = '/cAISTGI96O3DA3ka3mdNt4hTbZRINJ548snEKASSvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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