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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f5117bde49ab9c64c9d5777cd3d0d8c8616bb98aad29f92d0d1960429bac991' 
  AND token = 'zdSLnVhTb8dDjWxA33bwefv0pC5kZNDieDILFdQQ61U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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