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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362964a8fcba70963fdeb8bafcb1ee18f7a66c815092c7099d5c30ddd7f9d29f' 
  AND token = 'dvrEkTdDRiS5+9LewiKBvHM2a5Nt7h0QK93uDSL+Xw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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