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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f073eb892bb8e8b272f0c45965dd7e02b78b16764060ceb573f4d9b98f00baf' 
  AND token = 'o9U164gBGhjUCy4Mh++LLfa+lQ2GIU1fAcyrRc/UkEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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