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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d944380a464ebc03f9259689d8ed60494d20cca123ed575e77d7c4cd67d7351' 
  AND token = 'zsGH0N4S28OeWAYRF1adUmDI+HgwisLO4zQkRfF5+6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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