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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2562587afcba854eaa11c1b3e8f2c1800835d4c133630a3ed93c6804d83adb' 
  AND token = 'vBQJxeiVr2++g/F3i+qdkIFsGebBgXHsw9CLsmSEF1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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