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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce2ce5a2f678d66d6959138ec50e460074b9a79c7339d46c49f95e070d57517d' 
  AND token = 'Vg4q2bsPGu8p3pKpwv+NePkDe5FACyXWti57zqxolYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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