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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20af0768bc218d2f85d8ec72e9313582e95f64ff81a4dcb15bdab21f52608102' 
  AND token = 'EBtOzbl92bgssZGuX1EhQCA9w4sJGnpk6lLysO2Z0jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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