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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3c0a2cbfa14c3067507009bbf394390a467e558b46165fba8add0b625f13c76' 
  AND token = 'Z3BlqXaJYcJ6otAbLdFVUNQAiclsTtP7fwK9sZM0gjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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