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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8ee3f777c9850ed1e1d6a7c8b441ae0d91026f10191c79c9fb3a862ca26ebd' 
  AND token = 'xecskUkGByh9org2dQlMROf+wvC6TmR2p537vFHxDLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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