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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777d94df65e0d3b1ec76427911e1aec696acdcc116942addb6784ab603e4a072' 
  AND token = 'JSBm7K6/c+6kuabUT54Ibf4mFk+OFNOb35g32dwK89Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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