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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '943d63241cbe7df6e056323467e422013a978c9ae5124a9575eebb13aaaac682' 
  AND token = 'p8PiXSP4D3vz9Yua5CM07nyg4KZj/AaZwanUUV7uzA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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