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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4c6281f0d9b2bb9f36a33b1fec48b48ce36e877ed394e4d62abd7d7a546505' 
  AND token = 'NPgzCfaQ6nyvHsIr7NG+fzKPyW3kEVBPUEk8s9mp+yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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