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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '765c8e674d17300551c50c4f115b6c84ee4914d2d949c5bf783674f0067d2a0a' 
  AND token = 'FQTS3NDAPpBw8kEY1YzAUhptU7xRcSOs0Qc7SlNE1GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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