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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffbd173d612c5dfa38c5f5271fca5a2ce8ed02db1b463c95a1b1873a049f2f7' 
  AND token = 'r+sffHfTTZp1n90KqPQf97a++7ztp0uBZpnRNetW0SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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