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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8d7a473b25f62ea74fed7a5c6ddcf0a1bc83e72d932c0dab97771b268d16f5' 
  AND token = 'rBpemSqlfy7OwAkFopRJTgPOMf758ILh+5jt7yd9P/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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