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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1183210a6baf4461e58605c8ce99495b3469a6621df4ea5c6cb8ee3254f2474b' 
  AND token = '+modH67dth6eQfLB1R83EALybtp7B/XSgBtKR/c7fIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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