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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1dd6eee7d75ad2f199d1d3fc5bd7db9d4760d8171ba29964e55287802b3901' 
  AND token = 'aW2eLAso9nZ1O1/ypdCUYXnqmFCZ882e6Al1t9qvS1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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