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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4ab7c3df16ce3165d4862aeb2b60558f6826e11ccbecd9b3eb5345eb9adbbb' 
  AND token = '39QHk3F8WABprBzH8ch29tU8P584Go1Q+aqOrZAk3AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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