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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bba9d3db23aec52dc67d67f8c63fea954de26a3c52d3e7b563306c57ad55be3' 
  AND token = 'rbDoRi3oZXRMBhbc4La/QKF/BvJ/74HEVaj8I3kAFis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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