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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be77b6232c2c187c989c3fea1744ca30a7f758a4ed4e3b1aead721f94c5805b6' 
  AND token = 'O60U8M8dXT5aLyIT+iqRQPFWSEqr3l4e3W4mKISwLwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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