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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6d04ee616a69b55422dbc9e9dde41d79a37938295772316ec1495e96e6cb9e' 
  AND token = 'pEKsKnbnyTDb8Mq8vDGotxLBN6r2fEfFW4xf18+H+c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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