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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee75ada7f4f6cf7b9628f150a34a55efd0b1e1cba7983aba9fe89de2690ac8e' 
  AND token = '93DF865mx9QuB7RtZWklQCAlCiwK/TDE5AwQ24vE0/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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