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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48194961d65d9d42d4995990aae11d1e698d18f715de642fa9738b21b8987a36' 
  AND token = '5XsceyG39+XiAuJ2l9hhEG4pQkmnELQTelAyYqS9Gps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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